HLA-DPB1 alleles association of anticardiolipin and anti-beta2GPI antibodies in a large series of European patients with systemic lupus erythematosus

Abstract

Our objective was to determine the HLA-DPB1 allele associations of anticardiolipin (aCL) and anti-beta₂ GPI (aβ₂ GPI) antibodies, and of clinical manifestations of the antiphospholipid syndrome (APS), in systemic lupus erythematosus(SLE). We studied 577 European patients with SLE. aCL and aβ₂ GPI antibodies were measured by ELISA. Molecular typing of HLA-DPB1 locus was performed by polymerase chain reaction-sequence specific oligonucleotide probe (PCR-SSOP) method. aCL showed positive association with -DPB1*1501 (P 0.005, OR 7.4), and -DPB1*2301 (P 0.009, OR 3.3). aβ₂ GPI showed positive association with -DPB1*0301 (P 0.01, OR 1.9), and -DPB1*1901 (P 0.004, OR 8.1). In addition, livedo reticularis was associated with -DPB1*1401, and Raynaud’s phenomenon with -DPB1*2001. In conclusion, HLA-DPB1 locus may contribute to the genetic predisposition to develop antiphospholipid antibodies and clinical manifestations of the APS in patients with SLE.